Class [Mammalia] Linnaeus, 1758 - mammals Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818 Family Didelphidae Gray, 1821 - American opossums Genus Didelphis Linnaeus, 1758 - large American opossums Didelphis azarae Temminck, 1824 sensu Tschudi, 1845:143 see Didelphis albiventris Lund, 1840